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Tue 9 Jul, 2019 05:59 am
Hello!
I don't understand redshift as a proof of accelerating expansion.
I am by no means a physics scolar, so I suspect the answer isn't straightforward:
Big bang event happened almost 14 billion years ago. During this event, everything expanded at an extreme rate. Today, when looking at objects further away, we can see that redshift increase with the distance. If the object is 12 billion light years away from us, then we see light that was generated 12 billion years ago. I don't understand how this can tell us anything about the present status of that object. Since I see light emitted at a time closer to big bang, I would expect more redshift if universe expanded faster at the moment the light was emitted.
@Mederman,
Redshift alone is evidence for expansion but not acceleration of expansion. Many detailed measurements such as Cepheid Variables, indicate acceleration.
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